Question

difference between atomic no. and mass no.

Answer 1

Answer:

Difference Between Atomic Mass and Atomic Number

Atomic Mass

Atomic Number

Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element’s nucleus.

It is the average weight of an element. It is the total number of protons in the atom’s nucleus.

Atomic mass is denoted by A The letter Z is used to represent an atomic number.

Atomic mass cannot be be used to define the type of element. Atomic number mainly helps in the classification and identification of an element.

Atomic mass is also used to classify different isotopes of the same element Isotopes only share the same atomic number.

Atomic mass is mostly measured using atomic mass unit (amu). Atomic number is just a digit that is used to place elements in a periodic table.

Answer 2

Answer:

The current periodic table is set in such a way that all the elements have an increasing atomic number, and consequently, increasing mass number. But do we know what mass number, or even what atomic number is? Well, as we know, an atom comprises of electrons, protons, and neutrons. The number of electrons in the outer most shells gives us the valency of the atom. In the same way, the number of protons and neutrons are related to the atomic number and mass number of the atom.